[MPlayer-DOCS] Makefile.inc fixes? [patch]

[Torinthiel]

I have created what I believe to be Makefile.inc fixes.
Namely it adds missing .PHONY for all, html-single and html-chunked,
makes the xsl dependency creating a bit more readable IMHO and makes
HTML_DIR and HTML_FILE error checking internal in make. Please comment.
Torinthiel

-- 
 Waclaw "Torinthiel" Schiller       GG#: 542916, 3073512
   torinthiel(at)wp(dot)pl
   gpg: B06901F1 fpr: FAA3 559F CAE9 34DE CDC8  7346 2B6E 39F2 B069 01F1
 "No classmates may be used during this examination"
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